Hi, On Mon, Nov 10, 2014 at 5:30 PM, Pat David <patdavid@xxxxxxxxx> wrote: > I can't add much to the color discussion, but at least I can offer up just > about any of my images as RAW for any testing (just about everything I > shoot is cc-by-sa usually). If anyone finds one of mine they would like, > just let me know and I'd be happy to provide the camera raw file. I was actually gonna suggest to perhaps ask you, in particular for the "nice set of pictures of people's faces, young to old, male and female, of diverse skin colors." since I know you like to shoot people. That may be a start. Since you forgot to add a link to your photos (maybe out of humility?), here they are: https://www.flickr.com/photos/patdavid Unfortunately I am about the same for the actual color discussion part, and I'm not sure which photos are the best for color/printer/algorithms/other tests, but I can for instance host the test suite photos. Maybe under testimages.libreart.info or some similar URL. So I suggest that if someone on this thread thinks that this or that photo is interesting, tell me, and I'll make a test page gathering raw photos. With time, I think we should be able to gather a good suite of standard copyleft test photos. Jehan > On Fri, Nov 7, 2014 at 1:24 PM, Elle Stone <ellestone@xxxxxxxxxxxxxxxxxxxx> > wrote: > >> On 11/07/2014 10:25 AM, Jehan Pagès wrote: >> >>> >A good test suite of "copyleft" images would be a nice thing to have, >>>> >whether for testing new and existing editing algorithms, or for whatever >>>> >testing that individual GIMP users might want to do on their own >>>> >(printer-related, for example). >>>> >>> That's a good idea. What kind of images would be the most interesting? >>> Basically should that be images, taken with a good digital camera, of >>> a lot of objects of various colors? >>> It could also be images with color gradients, I guess (sunset/rise and >>> such)? >>> Or do you already have such copyleft images at your disposal that you >>> could provide? >>> Indeed if we could gather these for access to anyone as reference >>> (then various software could use them for their own tests), it would >>> be great. >>> >>> Jehan >>> >>> >> Nicolas Robidous's test image collection is very nice, in particular the >> baby's face and the brightly colored buildings make great test images. His >> images are already converted to sRGB, which means they can't really fully >> exercise the color gamuts of reasonably decent printers and wider gamut >> displays. >> >> I can make available "straight from the camera interpolated raw file, no >> enhancements added" images of very saturated (outside the sRGB color gamut) >> natural objects, mostly flowers. >> >> I've also put together various artificial color ramps, granger rainbows, >> stepped gray scales, and such. And I have IT8 target shots from several >> cameras, which I think the photographers would release under an appropriate >> license. >> >> I wish that I had a nice set of pictures of people's faces, young to old, >> male and female, of diverse skin colors. Skin tones are something that >> everyone wants to get "just right", so faces make great test images. Such >> photographs ideally would be shot raw under natural daylight, more or less >> full frame, and properly white balanced, preferably with a white balancing >> object discretely placed somewhere in the image frame (styrofoam cups, PVC >> plastic, white coffee filters all work really well, often as well as >> commercially available white balancing aids). >> >> High quality images with good gradients would be a nice addition to a >> collection of test images. Interpolated raw files that have been output in >> a wider gamut color space would be more versatile than images that have >> already been converted to sRGB. >> >> Here are links to some sample collections of copyrighted test images: >> >> http://www.pcstats.com/articleimages/200601/samsungspp2040_300dpi1.jpg >> >> I would love to have enough copyleft images to put together a copyleft >> composite similar to the one in the above link. >> >> http://www.northlight-images.co.uk/article_pages/test_images.html >> >> http://www.outbackphoto.com/printinginsights/pi048/essay.html >> >> >> Thinking more about "what kind of images", it depends on who's testing >> what. Here are some possible reasons for wanting test images: >> >> * Testing scaling algorithms. >> >> * Testing ICC profile conversions from wider gamut color spaces to printer >> profiles and/or to display screen profiles. >> >> * Testing the quality of prints made by a commercial or personally owned >> printers. >> >> So the first question is: What kind of test images, for what kinds of >> testing, do you all, as a diverse group of GIMP users and developers, wish >> you had access to? >> >> Elle >> >> >> _______________________________________________ >> gimp-developer-list mailing list >> List address: gimp-developer-list@xxxxxxxxx >> List membership: https://mail.gnome.org/mailman/listinfo/gimp- >> developer-list >> List archives: https://mail.gnome.org/archives/gimp-developer-list >> > > > > -- > pat david > http://blog.patdavid.net > _______________________________________________ > gimp-user-list mailing list > List address: gimp-user-list@xxxxxxxxx > List membership: https://mail.gnome.org/mailman/listinfo/gimp-user-list > List archives: https://mail.gnome.org/archives/gimp-user-list _______________________________________________ gimp-developer-list mailing list List address: gimp-developer-list@xxxxxxxxx List membership: https://mail.gnome.org/mailman/listinfo/gimp-developer-list List archives: https://mail.gnome.org/archives/gimp-developer-list
